https://phys.org/news/2018-11-satellite-tropical-cyclone-bouchra-reborn.html > In general, wind shear is a measure of how the speed and direction of winds change with altitude. Wind shear can tear a tropical cyclone apart or weaken it. > On Nov. 19 at 10 a.m. EST (1500 UTC) Bouchra's maximum sustained winds were near 50 knots (57 mph/92 mph) making it a tropical storm. It was located approximately 672 nautical miles southeast of Diego Garcia near 15.2 south latitude and 80.4 east longitude. Bouchra was moving southwestward and is expected to maintain intensity over the next several days before weakening.